support querying multiple nodes for index scan
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Key: CASSANDRA-1156
URL: https://issues.apache.org/jira/browse/CASSANDRA-1156
Project: Cassandra
Issue Type: Sub-task
Reporter: Jonathan Ellis
Fix For: 0.7
given CASSANDRA-1155, we should query multiple nodes for the rows corresponding
to the given index criteria, such that we have a 90% chance of getting enough
rows w/o having to do another query (but, if our estimate is incorrect, we do
need to loop and do a 2nd query).
we start with the first node in token order, so that we only have to query a
single node for low cardinality (i.e., every index value has many rows
associated with it). we do this by ordering the keys in the index row, in
partitioner order.
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